package com.yanxibao.util;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.yanxibao.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Enumeration;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.yanxibao.util.RedisConstants.LOGIN_USER_KET;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 获取请头中的token
        String token = request.getHeader("Authorization");
        if(StrUtil.isBlank(token)){
            // token直接放行
            return true;
        }
        // 基于token获取redis中的用户信息
        String key = LOGIN_USER_KET + token;
        Map<Object, Object> entries = stringRedisTemplate.opsForHash().entries(key);
        if(entries.isEmpty()){
            // 放行
            return true;
        }
        // 将查询到的Hash数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(entries, new UserDTO(), false);
        // 保存用户信息到ThreadLocal中
        UserHolder.saveUser(userDTO);
        // 刷新token有效期
        stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.DAYS);
        // 放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
